Wear of Abrasive Particles in Slurry During Lapping

2014 ◽  
Author(s):  
James T. Lehner ◽  
Christopher A. Brown
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Design Of Experiments ◽  
Abrasive Particle ◽  
Steel Ball ◽  
Abrasive Particles ◽  
Individual Variable ◽  
Stainless Steel Ball ◽  
Experimental Runs

Changes in abrasive particle size, shape, and sharpness are studied in multi-axis lapping of sealing regions of stainless steel ball valves. Twelve experimental runs, investigating changes in the abrasive particle as a function of lapping load and motion, are performed during lapping. The influence of changes in the lapping load and motion are investigated using design of experiments. Changes in the size, shape, and sharpness of the abrasive particle are influenced by the load and by the motion of the seats and balls of the valves. Combinations of lapping load and motions, as opposed to any individual variable, tend to dominate the influence on the changes in the abrasive particle.

Quantitative Mechanochemical Methanation of CO2 with H2O in a Stainless Steel Ball Mill

2020 ◽  
Vol 93 (9) ◽  
pp. 1074-1078 ◽  
Author(s):  
Yoshinari Sawama ◽  
Miki Niikawa ◽  
Kazuho Ban ◽  
Kwihwan Park ◽  
Shin-yo Aibara ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Ball Mill ◽  
Steel Ball ◽  
Stainless Steel Ball

Effects of Viscosity, Particle Size, and Particle Shape on Erosion in Gas and Liquid Flows

2011 ◽  
Author(s):  
Risa Okita ◽  
Yongli Zhang ◽  
Brenton S. McLaury ◽  
Siamack A. Shirazi ◽  
Edmund F. Rybicki
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Solid Particle ◽  
Abrasive Particle ◽  
Glass Beads ◽  
Solid Particle Erosion ◽  
Particle Sizes ◽  
Particle Erosion ◽  
Particle Velocities ◽  
Liquid Flows

Although solid particle erosion has been examined extensively in the literature for dry gas and vacuum conditions, several parameters affecting solid particle erosion in liquids are not fully understood and need additional investigation. In this investigation, erosion ratios of two materials have been measured in gas and also in liquids with various liquid viscosities and abrasive particle sizes and shapes. Solid particle erosion ratios for aluminum 6061-T6 and 316 stainless steel have been measured for a direct impingement flow condition using a submerged jet geometry, with liquid viscosities of 1, 10, 25, and 50 cP. Sharp and rounded sand particles with average sizes of 20, 150, and 300 μm, as well as spherical glass beads with average sizes of 50, 150 and 350 μm, were used as abrasives. To make comparisons of erosion in gas and liquids, erosion ratios of the same materials in air were measured for sands and glass beads with the particle sizes of 150 and 300 μm. Based on these erosion measurements in gas and liquids, several important observations were made: (1) Particle size did not affect the erosion magnitude for gas while it did for viscous liquids. (2) Although aluminum and stainless steel have significant differences in hardness and material characteristics, the mass losses of these materials were nearly the same for the same mass of impacting particles in both liquid and gas. (3) The most important observation from these erosion tests is that the shape of the particles did not significantly affect the trend of erosion results as liquid viscosity varied. This has an important implication on particle trajectory modeling where it is generally assumed that particles are spherical in shape. Additionally, the particle velocities measured with the Laser Doppler Velocimetry (LDV) near the wall were incorporated into the erosion equations to predict the erosion ratio in liquid for each test condition. The calculated erosion ratios are compared to the measured erosion ratios for the liquid case. The calculated results agree with the trend of the experimental data.

Influences of Cobalt Content on the Physical and Tribological Properties of Cemented Tungsten Carbide Used in Sheet Metal Forming Application

2014 ◽  
Vol 966-967 ◽  
pp. 80-86
Author(s):  
Varunee Premanond ◽  
Onnjira Diewwanit
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Friction Coefficient ◽  
Tungsten Carbide ◽  
Cobalt Content ◽  
Steel Ball ◽  
Cemented Carbide ◽  
Average Grain Size ◽  
Stainless Steel Ball ◽  
Cemented Tungsten Carbide

The objective of this work is to investigate the tribological behavior between WC-Co cemented carbide and austenitic stainless steel under repeated rotation sliding. Influences of cobalt content of commercial grade cemented tungsten carbide on friction coefficient and material transfer phenomena have been explored. Three grades of commercial WC-Co cemented carbide with similar medium WC grain size were employed; WC-12Co, WC-14Co and WC-19Co. The average grain size were ranges between 0.85-1.1 μm and the hardness of about 86-88 HRA have been given by the material maker. The composition analysis and the average grain size of tungsten carbide have been rechecked. Furthermore, the carbide grain size distribution was recorded and the fracture toughness was calculated for each WC-Co grade. The experiments were carried out using ball on disk test. The ball was made from SUS304 grade and the disk was fabricated by 3 grades of WC-Co cemented carbide. The friction coefficient was measured under dry sliding. The characteristics of contact surfaces were explored on the ball as well as on the disk after tests to reveal the presence of a metallic transfer on the WC-Co cemented carbide disk and the wear scar on the ball. The measurement results of wear volume on the stainless steel ball disclosed that maximum wear rate was found from the stainless steel ball rub against WC-19Co tool material.

scholarly journals Relationship between Real Contact Area and Adhesion Force of Plasma-Treated Rubber Sheets Against Stainless-Steel Ball

2008 ◽  
Vol 3 (7) ◽  
pp. 361-365 ◽  
Author(s):  
Jong-Hyoung Kim ◽  
Isami Nitta ◽  
Noritsugu Umehara ◽  
Hiroyuki Kousaka ◽  
Mamoru Shimada ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Contact Area ◽  
Adhesion Force ◽  
Steel Ball ◽  
Real Contact Area ◽  
Real Contact ◽  
Stainless Steel Ball

Stainless Steel Ball Pins in the Car Chassis

ATZ worldwide ◽  
2013 ◽  
Vol 115 (10) ◽  
pp. 40-43
Author(s):  
Jochen Kruse ◽  
Stephan Hasler ◽  
Volker Dünkel
Keyword(s):  
Stainless Steel ◽  
Steel Ball ◽  
Stainless Steel Ball

scholarly journals Raman Spectra of Graphite and Diamond Mechanically Milled with Agate or Stainless Steel Ball-Mill

1995 ◽  
Vol 36 (2) ◽  
pp. 282-288 ◽  
Author(s):  
K. Niwase ◽  
T. Tanaka ◽  
Y. Kakimoto ◽  
K. N. Ishihara ◽  
P. H. Shingu
Keyword(s):  
Stainless Steel ◽  
Raman Spectra ◽  
Ball Mill ◽  
Steel Ball ◽  
Stainless Steel Ball

Friction Behavior of Poly (Vinyl Alcohol) Gel Against Stainless Steel Ball in Different Lubricant Media

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Yu-Song Pan ◽  
Dang-Sheng Xiong ◽  
Xiao-Lin Chen
Keyword(s):  
Stainless Steel ◽  
Friction Coefficient ◽  
Vinyl Alcohol ◽  
Free Water ◽  
Steel Ball ◽  
Poly Vinyl Alcohol ◽  
Friction Behavior ◽  
Sliding Speed ◽  
Stainless Steel Ball ◽  
Pva Hydrogel

The effects of different variables on the friction coefficient of poly(vinyl alcohol) (PVA) hydrogel and stainless steel ball counterpart were investigated by a ball-on-plate friction and wear tester. Factors included lubrication condition, sliding speed, diameter of stainless steel ball, and load. It is shown that the free water in PVA hydrogel has a good lubrication on the friction counterpart. The friction coefficients have little difference between dry and lubricated conditions during the initial test stage. With the time prolonged, friction coefficient of PVA hydrogel under dry condition sharply increased within a short time. Friction coefficient decreased with increasing sliding speed and diameter of stainless steel ball. The decrease in the friction coefficient in bovine serum was 55.38% while the sliding speed increased from 45rpmto225rpm. The friction coefficient increased as the load increased, and the effect was more conspicuous at low load region.

Molecular Dynamics Simulation of Mechanical Polishing on Stainless Steel Using Diamond Nanoparticles

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Prabhat Ranjan ◽  
R. Balasubramaniam ◽  
V.K. Jain
Keyword(s):  
Molecular Dynamics ◽  
Stainless Steel ◽  
Molecular Dynamics Simulation ◽  
Abrasive Particle ◽  
Mechanical Polishing ◽  
Dynamics Simulation ◽  
Abrasive Particles ◽  
Diamond Nanoparticles ◽  
Process Behavior ◽  
Scheduled Time

Mechanical polishing is one of the essential attributes of nanofinishing. To maintain precision during nanofinishing process, the mechanical polishing needs to be studied and analyzed at nanometric scale. In view of this, a set of molecular dynamics simulation has been carried out to analyze the process behavior and its effects on abrasive particles. After simulation, it is observed that the finishing force and velocity damage the abrasive particle by changing its phase from diamond cubic to graphite. Thus, the abrasive particles need replacement in a scheduled time-bound manner. In addition, a strategy has been proposed for efficient and economic polishing.

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